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CloneAnalyzer.php
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CloneAnalyzer.php
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<?php
namespace Psalm\Internal\Analyzer\Statements\Expression;
use PhpParser;
use Psalm\CodeLocation;
use Psalm\Context;
use Psalm\Internal\Analyzer\MethodAnalyzer;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\MethodIdentifier;
use Psalm\Issue\InvalidClone;
use Psalm\Issue\MixedClone;
use Psalm\Issue\PossiblyInvalidClone;
use Psalm\IssueBuffer;
use Psalm\Type\Atomic\TFalse;
use Psalm\Type\Atomic\TMixed;
use Psalm\Type\Atomic\TNamedObject;
use Psalm\Type\Atomic\TNull;
use Psalm\Type\Atomic\TObject;
use Psalm\Type\Atomic\TTemplateParam;
use function array_merge;
use function array_pop;
/**
* @internal
*/
class CloneAnalyzer
{
public static function analyze(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr\Clone_ $stmt,
Context $context
): bool {
$codebase = $statements_analyzer->getCodebase();
$codebase_methods = $codebase->methods;
if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->expr, $context) === false) {
return false;
}
$stmt_expr_type = $statements_analyzer->node_data->getType($stmt->expr);
if ($stmt_expr_type) {
$clone_type = $stmt_expr_type;
$immutable_cloned = false;
$invalid_clones = [];
$mixed_clone = false;
$possibly_valid = false;
$atomic_types = $clone_type->getAtomicTypes();
while ($atomic_types) {
$clone_type_part = array_pop($atomic_types);
if ($clone_type_part instanceof TMixed) {
$mixed_clone = true;
} elseif ($clone_type_part instanceof TObject) {
$possibly_valid = true;
} elseif ($clone_type_part instanceof TNamedObject) {
if (!$codebase->classlikes->classOrInterfaceExists($clone_type_part->value)) {
$invalid_clones[] = $clone_type_part->getId();
} else {
$clone_method_id = new MethodIdentifier(
$clone_type_part->value,
'__clone'
);
$does_method_exist = $codebase_methods->methodExists(
$clone_method_id,
$context->calling_method_id,
new CodeLocation($statements_analyzer->getSource(), $stmt)
);
$is_method_visible = MethodAnalyzer::isMethodVisible(
$clone_method_id,
$context,
$statements_analyzer->getSource()
);
if ($does_method_exist && !$is_method_visible) {
$invalid_clones[] = $clone_type_part->getId();
} else {
$possibly_valid = true;
$immutable_cloned = true;
}
}
} elseif ($clone_type_part instanceof TTemplateParam) {
$atomic_types = array_merge($atomic_types, $clone_type_part->as->getAtomicTypes());
} else {
if ($clone_type_part instanceof TFalse
&& $clone_type->ignore_falsable_issues
) {
continue;
}
if ($clone_type_part instanceof TNull
&& $clone_type->ignore_nullable_issues
) {
continue;
}
$invalid_clones[] = $clone_type_part->getId();
}
}
if ($mixed_clone) {
IssueBuffer::maybeAdd(
new MixedClone(
'Cannot clone mixed',
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
if ($invalid_clones) {
if ($possibly_valid) {
IssueBuffer::maybeAdd(
new PossiblyInvalidClone(
'Cannot clone ' . $invalid_clones[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
} else {
IssueBuffer::maybeAdd(
new InvalidClone(
'Cannot clone ' . $invalid_clones[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
return true;
}
$statements_analyzer->node_data->setType($stmt, $stmt_expr_type);
if ($immutable_cloned) {
$stmt_expr_type = clone $stmt_expr_type;
$statements_analyzer->node_data->setType($stmt, $stmt_expr_type);
$stmt_expr_type->reference_free = true;
$stmt_expr_type->allow_mutations = true;
}
}
return true;
}
}